Hk P7M8.The striker-fired HK VP90 was a very early entrant into the JSSAP (XM9) trials.
It was actually the P7M13 and it was terminated 18-SEP-1984 for failing reliability and corrosion resistance..
The other players involved
Steyr GB Terminated 4-May-1984 poor reliability
FN BDA withdrew 31-May-1984
Colt SSP withdrew 18-JJul-1984
Walther P88 Terminated 18-Sep-1984 Failing drop test, corrosion resistance, and adverse conditions.
S&W 459M Terminated 18-Sep-1984 Failing service life and Firing Pin energy
Sig P226 Technically Acceptable
Beretta 92SB-F Technically Acceptable